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This paper addresses the control problem of extending the travel range of a MEMS electrostatic actuator through a closed-loop voltage control scheme. Since the electrostatic actuator is inherently unstable due to its pull-in limit, one of the major control goals is to stabilize the actuator system beyond the limit. In addition, the controller has to be robust against external disturbances and noise...
A novel application, employing the strategy of active disturbance rejection control and an extended state observer, is proposed to control the rotor shaft position of NASA's high speed shaft (HSS) flywheel using active magnetic bearings. The robustness of the control is demonstrated in a frequency domain analysis and in simulations to be a major improvement of controls recently studied at NASA.
A new control method is presented to drive the drive axis of a MEMS gyroscope to resonance and regulate the output amplitude of the axis to a fixed level. It is based on a unique active disturbance rejection control (ADRC) strategy, which actively estimates and compensates for internal dynamic changes of the plant and external disturbances in real time. The stability analysis shows that both the estimation...
The paper presents a novel oscillation controller for controlling the driving mode (or drive axis) of a vibrational gyroscope to oscillate at a desired trajectory. The controller consists of a PD controller and an online extended state observer (ESO). The ESO is used to estimate the system states and the discrepancy between the real system and the mathematical model of the gyroscope. The PD controller...
This paper presents a new control strategy known as active disturbance rejection control (ADRC) for controlling the sense axis of a vibrational MEMS gyroscope and detecting time-varying rotation rates. In the ADRC framework, the generalized disturbance, which is referred to as the combination of the internal dynamics and external disturbances, is estimated and compensated for in real time. It is assumed...
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